1964: The Pentagon, worried about nuclear proliferation, set up a small-scale experiment to find out how easy it would be for a country starting with no relevant expertise to build a nuclear bomb. The Nth Country Project chose two scientists to represent the attempts of the fictitious country to produce such a device. The scientists held doctorates in physics, but, crucially, their knowledge of nuclear physics was limited and they had no access to classified information. After 2½ years, they came up with a feasible design. Their bomb was powerful enough that it would have produced an explosion similar in size to the one dropped on Hiroshima, yet simple enough that it “could have been made by Joe’s Machine Shop downtown”.
Source: The Guardian, 24 June 2003